Core draw apparatus



P 1953 P. s. HARDY' I 2,851,749 I CORE DRAW APPARATUS Filed Aug. 14. 1956 ,2 Z2 12 V 'INVENTOR. v PETER E1. HARDY f4 ,5 I; ,8 fl rfls i A T TDRNEY- CORE DRAW APPARATUS Peter S. Hardy, Trumbull, Conu., assignor to Peerless Aluminum Foundry Co., Inc., Bridgeport, Conn, a corporation of Connecticut Application August 14, 1956, Serial No. 603,95

4 Claims. on. 22-10 The present invention relates to a core draw apparatus, particularly for attachment to a sand molders work bench for the purpose of applying vibrations to a packed core box to facilitate the removal of the core therefrom preparatory to the subsequent baking of the core.

An object of the invention is to provide an apparatus of this type which may be mounted upon either side of a. work bench.

Another object is to provide such apparatus which permits of convenient adjustment of the vibratory panel against which the core box is engaged to accommodate core boxes having angular variation in the side surface, certain boxes having vertical sides while others have inclined sides.

A further object is to provide adjustable stop means to support the core box engaged with the vibratory panel against longitudinal displacement, such means being readily adjustable to accommodate diiferent length core boxes without disturbing the adjustment of the other parts of the apparatus.

Other objects and advantages of the invention will hecome apparent from a consideration of the following detailed description taken in connection with the accompanying drawing wherein a satisfactory embodiment of the invention is shown. However, it will be understood that the invention is not limited to the details disclosed but includes all such variations and modifications as fall within the spirit of the invention and the scope of the appended claims.

In the drawings:

Fig. 1 is a front elevation of the core draw apparatus according to the invention, the same being shown mounted upon the right hand side of a work bench;

Fig. 2 is a top plan view;

Fig. 3 is a rear elevation;

Fig. 4 is a vertical sectional view taken along the line 4-4 of Fig. 1;

Fig. 5 is a fragmentary vertical sectional view, on an enlarged scale, taken along the line 55 of Fig. 3;

Fig. 6 is a fragmentary horizontal sectional view, also on an enlarged scale, taken along the line 6-6 of Fig. 3; and

Fig. 7 is a perspective view showing a sand molders work bench provided with the core draw apparatus of the invention.

Referring to the drawings, the core draw apparatus, according to the illustrated exemplary embodiment of the invention, comprises a supporting frame 10, comprising a horizontal rectangular frame portion 11 provided at its two ends with vertically disposed post receiving sleeve portions 1212, one of which is engaged by a post 13 secured in the vertical sleeve portion 14 of an attaching bracket 15 by means of a set screw 16, the attaching bracket adapted to be secured to the under side of the work bench 17 by bolts 18. The sleeve portion 12 of the supporting frame is secured to the post by a set nited States Patent Patented Sept 16, 1953 of the supporting frame it is possible to mount the apparatus at either side of the work bench 17, the post 13- being engaged with the left hand sleeve portion 12 when mounted at the right hand side of the work bench, and being engaged with the right hand sleeve portion 12 when mounted at the left hand side of the work bench.

A horizontal table 21, preferably in the form of a relatively heavy steel plate or the like, is mounted on the supporting frame 10 by means of bolts 22 engaged upwardly through openings 23 in the body portion 11 and screwed into threaded pockets 24 in the under side of the plate, bushings 25 of rubber or the like being disposed tion. By providing the sleeve portions 12 at each side within the openings 23 to provide vibration dampening cushion support between the plate and the supporting frame, whereby the plate is capable of being vibrated without imparting appreciable vibrations to the supporting frame.

The supporting frame is provided at its rearward side with a pair of right-angular post portions 26 which extend horizontally beneath the rearward edge of the plate 21 and vertically upwardly in back of. the plate, and adjustably support a vibration imparting panel member 27. The panel member is of generally rectangular outline and is provided at its rearward side with a pair of rearwardly extending lugs 28-28 pivotally supported upon the respective posts 26 by means of bolts 29 for tilting movement of the panel about a central horizontal axis, the lugs each being disposed at the same side of the respective posts, i. e., the right hand side as seen in Fig. 2, to permit unimpeded vibration of the panel, as will presently more fully appear.

Each of the bolts 29 is engaged through a hole 30 in the respective posts 26 and through an enlarged hole 31 in the respective lugs 28, a bushing 32 of rubber or the like being disposed within the hole 31, and separation washers 33 being respectively provided at the ends of the bushing 32, between the post and the lug and between the lug and lock nuts 34 screwed upon the threaded end of the bolt. The washers 33 may be of rubber, neoprene, or other suitable cushioning material, and with the bushing 32 serve to provide 'a vibration dampening cushion support for the panel so that vibrations of the panel will not be appreciably transmitted to the supporting frame.

The angular position of the panel is fixed by a pair of screws 3535 screwed into threaded holes 36 in the respective posts 26 in equally spaced relation above and below the pivot axis of the bolts 29. The adjusted position of each of the screws 35 is fixed by a lock nut 37, and the ends of the screws each have vibration dampening cushioned engagement with the panel by means of a metal disc 38 disposed in each of a pair of pockets 39-69 in the rearward side of the panel, each disc being resiliently supported by cushion blocks 40 of rubber or the like disposed in the respective pockets beneath the metal disc. Thus, while the screws maintain the position of adjustment of the panel, vibrations imparted to the panel are not transmitted to the supporting frame through the screws 35.

Substantially centrally of the rearward side of the panel there is provided a rearwardly projecting lug 41 to which a pneumatic vibration unit 42 is rigidly secured by a bolt 43, air being supplied to this unit through a hose 44 and actuation of the unit being controlled by a knee-operated valve 45 mounted at a convenient location upon the work bench.

Upon the face of the panel there are provided a series of vertical ribs 46 which are adapted to rigidly position a stop member 47 in selected positions of adjustment. The stop member is provided upon its rearward side with a rib 48 which is adapted to seat in the grooves between the ribs 416, and is provided at its lower end with a clamping flange 49 which extends beneath the lower edge of the panel and is provided with an inclined clamping surface 50 for clamping engagement with a bevelled surface 51 extending along the lower edge of the panel. A similar bevelled surface 52 extends along the upper edge of the panel and is adapted to be clampingly engaged by a thumb screw 53 engaged in a rearwardly extending flange 54 provided at the upper end of the stop member 47.

The clearance between the upper edge of the panel and the flange 54 is such withrespect to the depth of the grooves between the ribs 46 that upon loosening the thumb screw the stop member can bemoved forwardly sufliciently to disengage its rib 48 from between the ribs 46, so that the stop member may be slid to any adjusted position without interference of any of the parts, tightening of the thumb screw drawing the rib 48 into the selected space beween the ribs 46. Preferably the ribs 46 and 48 have tapered sides so that upon tightening of the thumb screw 53 they engage with a wedge fit to thus rigidly secure the stop member to the panel. 4

In operation, as seen in Fig. 7, the core box 55 having a sand core 56 packed therein together with a supporting board 57, is placed by the molder upon the table 21, and thereupon the core box is pressed against the vibration panel 27 with one end of the core box held against the stop 47. By pressing the knee-operated valve 45, the vibration unit is actuated to impart vibrations to the panel causing the core box which is supported upon the cushioned table 21 to vibrate to loosen the core, enabling the operator to draw the core from the box bylifting the box along the vibration panel, the core remaining on the board 57 so that it can be transferred to the bake oven.

What is claimed is:

1. A core draw apparatus of the character described, comprising a supporting frame, a horizontal table mounted upon said supporting frame, a vibration panel supported upon said frame for engaging the rearward side of a core box or the like supported upon said table, a vibration unit connected to said panel to vibrate it, said panel being of rectangular outline and provided upon its face with a series of longitudinally spaced vertical ribs having -rearwardly divergent side surfaces forming rearwardly convergent grooves between them, a stop member having a vertical rib for wedging engagement in a selected groove between a pair of adjacent ribs of said panel, and clamping means for securing said stop member in wedging engagement with a selected groove of said panel.

2. A core draw apparatus of the character described, comprising a supporting frame, a horizontal table mounted upon said supporting frame, avibration panel supported upon said frame for engaging the rearward side of a core box or the like supported upon said table, a

vibration unit connected to said panel to vibrate it, said panel being of rectangular outline and bevelled along its upper and lower edges, and being provided upon its face with a series of longitudinally spaced vertical ribs forming grooves between them, said bevelled edges being rearwardly convergent relative to each other, a stop member extending vertically across the face of said panel member having a vertical rib for engagement in a selected groove of said panel and being provided at its upper and lower ends with rearwardly projecting flanges, said lower flange having an inclined surface for engagement with said lower bevelled edge and said upper flange being normally upwardly spaced from said upper bevelled edge, and a thumb screw carried by said upper flange for clamping engagement with said upper bevelled edge and whereby said rib of said stop member is drawn rearwardly into said selected groove, the vertical distance between said upper and lower flanges being such relatively to the depth of said grooves that said rib of said stop member is adapted to be forwardly disengaged from said selected groove upon retraction of said thumb screw from its engagement with said upper bevelled edge.

3. A core draw apparatus of the character described, comprising a supporting frame having a pair of vertically extending posts, a horizontal table mounted upon said supporting frame, a vibration panel for engaging the rearward side of a core box or the like supported upon said table, a vibration unit connected to said panel to vibrate it, a pair of rearwardly extending lugs carried by said panel and pivotally connected to said posts for pivotal adjustment'movement about a common horizontal axis substantially centrally between the upper and lower edges of said panel, whereby the plane of said panel is angularly adjustable, and a pair of"adjustrnent screws carried by each of said posts respectively above and below said horizontal axis for fixing the position of angular adjustment of said panel. i

4. A core draw apparatus according to claim 3, wherein said lugs are respectively disposed at the same side of each of said posts.

References Cited in the file of this patent UNITED STATES PATENTS 176,052 Reagan Apr. 11, 1876 615,097 Nicholls Nov. 29, 1898 1,756,776 Wood Apr. 29, 1930 2,105,877 Carney Jan. 18, 1938 2,266,751 Goldberg et a1. Dec. 23, 1941 2,278,190 Bodi Mar. 31, 1942 

